code: def metric_name():
      return "roc_auc_evaluator__target"
  
file_path: fklearn/tests/tuning/test_utils.py
imports: import pandas
  import pytest
  from fklearn.training.classification import logistic_classification_learner
  from fklearn.metrics.pd_extractors import evaluator_extractor
  from fklearn.tuning.utils import get_avg_metric_from_extractor, get_best_performing_log, get_used_features, gen_key_avgs_from_dicts, gen_key_avgs_from_logs, order_feature_importance_avg_from_logs, gen_key_avgs_from_iteration, gen_dict_extract
label_desc: Use image node_id 3 for calling a global function with example usage: metric_name() and returns: str